Zulhikmah Marpaung, and Andre Hasudungan Lubis. “An Application Of Double Exponential Method For Forecasting Drug Sales Stock”. Jurnal Scientia 13, no. 04 (October 8, 2024): 1506-1513. Accessed December 3, 2024. https://infor.seaninstitute.org/index.php/pendidikan/article/view/2636.